Analytic geometry and principles of algebra (1913)
Ziwet, Alexander, 1853-1928, Hopkins, Louis Allen, joint author, Hedrick, E. R. (Earle Raymond), 1876-1943 · New York, The Macmillan Company · leaf 151
espectto Ox ; if it is not changed when x and y are replaced by — x and — i/,respectively, the curve is symmetric with respect to the origin ; if it isnot changed when ./• and y are interchanged, the curve is symmetric withrespect to y = x. 136. Slope of Secant. Let P{x, y) be any point of… … (3)or, (4) tan «! y or, substituting for y and y^ their values : tan «i = -^^^^ ^^ = a{x + x^). .T, — X VIII, § 13Sj POLYXOMIALS —THE PARABOLA 139 137. Slope of Tangent. Keeping the })oiiit P (Fig. 55)fixed, let the point F^ move along the parabola toward 7^; thelimiting position which the secant…
Geometry, Analytic
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